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3644 Kojitaku (1931 TW)
Classification: Main-belt Asteroid          SPK-ID: 2003644
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09438639299813588 3.1184e-08  
a 2.248342928817 6.8655e-09 au
q 2.036129949543099 6.946e-08 au
i 3.533702763198348 4.3372e-06 deg
node 355.2707135983372 5.4601e-05 deg
peri 82.06145393276157 6.0012e-05 deg
M 48.10492234266459 2.3321e-05 deg
tp 2458835.957052315730
(2019-Dec-18.45705232)
7.9829e-05 TDB
period 1231.380455089125
3.37
5.6402e-06
1.544e-08
d
yr
n .2923548108240388 1.3391e-09 deg/d
Q 2.460555908090901 7.5135e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2187  
   data-arc span      32262 days (88.33 yr)  
   first obs. used      1931-10-05  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44388  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:52:17  

Additional Information
 Earth MOID = 1.05496 au 
 Jupiter MOID = 2.71457 au 
 T_jup = 3.621 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.1   n/a MPO502188  
diameter diameter 5.764 km 0.079 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.371   0.072 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

3644 Kojitaku (1931 TW)          Discovered 1931-Oct-05 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1931 TW = 1973 AZ3 = 1977 FJ3 = 1978 PR2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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